How To Install A Dual Exhaust System

Use a steel donut gasket for best results at the exhaust manifold. Steel wedges itself into the manifold and pipe for exceptional sealing, and it resists extreme heat better than asbestos-style gaskets. It won't blow out.

As you can see, one of our Hi-Po manifolds suffered from a bad exhaust leak at the custom H-pipe. You don't have to worry about that with the Turbo dual exhaust system. It fits and seals properly.

You never know what you're going to encounter on older Mustangs. We ran into fitment issues when the righthand H-pipe was off by an inch. At first, we thought we would have to return it or visit a muffler shop. However, Brant put us in touch with the manufacturer, who suggested we bend the pipe ourselves. We placed one side under our left foot and pulled up on the right side. It was an easy fix for a perfect fit.

Support the H-pipe with a jackstand and snug the manifold stud nuts, but don't tighten them yet.

Exhaust pipes are tricky to fit because you must position them to clear the floorpan and driveshaft. Fit each loosely, and rotate the pipe until ideal clearance is achieved. Examine the angle at the muffler end to make sure it's square.

This is how an exhaust pipe installation should look when loosely fitted. You want at least 1 inch of clearance from the floor and driveshaft. Keep in mind that the shaft moves up and down with the rear axle as you drive.

Once you're confident of pipe fitment, gently drive the exhaust pipes into the H-pipe. Don't do like us-use a block of wood between the hammer and pipe to prevent distortion.

For '65-'66, this is how muffler fitment looks, with the center in and offset out. We're not certain why Ford did it this way considering the improved clearances when mufflers are fit offset in and centered out, but this is correct for those years. The Turbo dual exhaust system is designed this way for '65-'70 Mustang owners who want true dual exhausts.

Before tightening anything, check the exhaust system for proper fit. The 1-inch clearance allows room for the worst possible scenario: bottoming out in a dip and bumpy roads, among other things. Take vehicle weight off the rear axle and check your clearances again. Few things are more annoying than a driveshaft chaffing your mufflers or rear axle striking the tailpipes.